Dave McGuire wrote: > On Aug 23, 2008, at 1:52 PM, Dave N6NZ wrote: >> So, how much mileage could we get out of a cheap digital camera and >> replaced the IR blocking filter with a visible light reducing filter? >> There might be a cheap hackable camera that is suitable, since a >> lot of >> the low-end imagers are quite sensitive in IR. Old camcorders >> might be >> another bet. > > I'd be shocked and amazed if they could detect thermal IR.
Agree - there's a big difference between the short-wave IR that's used by common IR remote controls (which is easily seen on most any webcam) and the long-wave IR used in thermal imaging. You might be able to get a cheap CMOS imager to do it, but you'd probably need a fairly unobtainium long-wave IR filter, and possibly some sort of cooling rig. Maybe mount it on a Peltier junction - of course then you'd need some crazy insulation & sealing to keep it from frosting over. Gets complicated pretty fast. Go here for more info on thermal imaging: http://www.electrophysics.com/ Looks like most of their stuff works in the 7 - 14 micron wavelength. I've got an inexpensive IR thermometer though - $25 from SparkFun: http://www.sparkfun.com/commerce/product_info.php?products_id=86 You might be able to use something like that to hunt down hotspots, except that the response time is slow enough it would get pretty tedious. Eric _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
